Add call graph navigation to CDT. When cursor is in a function, allow user to jump to any function that calls this function, or any function that it calls. (within reason) bug 152847

Consolidate all the color pickers into a single, well thought out color manager with the ability to save and share color themes. Think inheritance (the PHP editor inherits the HTML and Java editor colors by default, plus adds a few of its own). Extra points for adding custom backgrounds or transparency. Eclipse needs to be made a whole lot prettier.

Add online documentation to CDT. Make it so I never need to shell out to read a manpage. I just type the first few letters of the function and it autocompletes and allows me to hit F2 (or whatever) to view full documentation.

Add a focus-follows-mouse mode for those of us who don't like having to click all the time (a view is selected the moment the mouse enters it). Also maybe add a keypress to switch between editors when they are tiled.

Add the ability to write plugins using jruby or groovy. First research and determine if this would make plugin writing noticeably easier. I think it would just because no compile is needed; you can change code on the fly Emacs Lisp style.